Drug Class: Cardioselective Beta-Blocker + Thiazide-Like Diuretic Combination | Form: Oral Tablet | Prescription Status: Prescription Only (Rx) — DRAP Registered
What is Blokium Diu 50mg Tablet? Blokium Diu 50mg contains Atenolol 50mg and Chlorthalidone 12.5mg — the standard starting strength of this fixed-dose beta-blocker and diuretic combination for hypertension management. Starting at this lower strength allows the cardiovascular system to adjust to the combined heart rate-reducing and fluid-eliminating effects before escalation to the 100mg strength if blood pressure control remains insufficient. For many patients this lower dose provides adequate long-term blood pressure control without requiring escalation — particularly elderly patients, those with lower body weight, and patients whose hypertension has a significant fluid-retention component. The convenient single daily tablet combining both medicines improves treatment compliance compared to taking two separate tablets.
What is Blokium Diu 50mg Used For?
- Hypertension initiation — standard starting dose for blood pressure management (ہائی بلڈ پریشر کی ابتدائی خوراک)
- Chronic stable angina — prevention of chest pain from reduced coronary blood flow (سینے کے درد کی روک تھام)
- Hypertension with fluid retention — oedematous hypertension where diuretic component provides additional benefit (سوجن کے ساتھ ہائی بلڈ پریشر)
- Maintenance hypertension — ongoing control in patients well-controlled at this lower strength
- Elderly hypertension — lower starting dose for older patients requiring cautious titration (بزرگ مریضوں میں ہائی بلڈ پریشر)
- Step-up therapy — initial dose before escalation to 100mg strength if needed
How Does it Work? Atenolol selectively blocks beta-1 adrenergic receptors in the heart — reducing heart rate, decreasing force of cardiac contraction, and lowering cardiac output to reduce blood pressure and myocardial oxygen demand. At 50mg this cardioselective action provides meaningful heart rate and blood pressure reduction while maintaining relatively good bronchial selectivity compared to non-selective beta-blockers. Chlorthalidone 12.5mg inhibits sodium and chloride reabsorption in the distal renal tubule — increasing urinary excretion of sodium and water to reduce circulating blood volume and vascular resistance. Chlorthalidone's exceptionally long 48 to 72-hour duration provides smooth sustained diuresis without peaks and troughs. Together at these lower doses they address elevated cardiac output and excess fluid volume — two key hypertension drivers — with a more tolerable side effect profile than the higher strength combination.
Dosage and Administration
⚠️ Never stop suddenly — abrupt Atenolol discontinuation causes dangerous rebound hypertension and can trigger heart attack or severe angina. Always reduce dose gradually under cardiologist supervision. Take in the morning to avoid nighttime urination from diuretic component. Monitor blood potassium, blood glucose, and uric acid regularly.
| Indication | Starting Dose | Frequency | Notes |
|---|---|---|---|
| Hypertension initiation | 1 tablet (50mg/12.5mg) | Once daily in morning | Increase to 100mg if needed after 4 weeks |
| Chronic stable angina | 1 tablet (50mg/12.5mg) | Once daily in morning | Adjusted by cardiologist |
| Elderly hypertension | 1 tablet (50mg/12.5mg) | Once daily in morning | May remain at this dose long-term |
| Maintenance hypertension | 1 tablet (50mg/12.5mg) | Once daily in morning | If adequate control achieved |
Active Ingredients
| Ingredient | Strength |
|---|---|
| Atenolol | 50mg |
| Chlorthalidone | 12.5mg |
Who Should NOT Take Blokium Diu 50mg?
- Allergy to Atenolol, Chlorthalidone, sulphonamide-derived medicines, or any component
- Severe bradycardia — resting heart rate below 60 beats per minute
- Cardiogenic shock or decompensated heart failure
- Second or third degree heart block without a functioning pacemaker
- Severe asthma or chronic obstructive pulmonary disease
- Severe peripheral artery disease
- Severe kidney impairment — Chlorthalidone ineffective and Atenolol accumulates dangerously
- Severe liver impairment
- Significant hypokalaemia or hyponatraemia — correct electrolyte imbalance before starting
- Gout — Chlorthalidone raises uric acid levels and can trigger acute gout attacks
- Pregnancy and breastfeeding — consult cardiologist before use
- Children under 18 years
Side Effects
Common: Fatigue and tiredness (تھکاوٹ), mildly slow heart rate, mild dizziness especially on standing, cold hands and feet, increased urination particularly during first weeks (پیشاب زیادہ آنا — صبح کی خوراک سے رات کو کم ہوتا ہے), mild muscle cramps, mild nausea — generally better tolerated at this lower strength than the 100mg combination.
Serious — Stop and seek emergency help immediately: Severely slow heart rate below 50 beats per minute with dizziness or fainting (دل کی دھڑکن بہت سست — فوری ہسپتال جائیں), sudden worsening of chest pain particularly if stopped abruptly (فوری مدد لیں), significant low blood potassium — severe muscle weakness and dangerous irregular heartbeat (پٹھوں کی کمزوری اور دل کی دھڑکن میں خلل — فوری مدد لیں), significant worsening of asthma or bronchospasm, severe allergic reaction with swelling of face or throat, severely low blood pressure with fainting (بے ہوشی — فوری مدد لیں), acute gout attack — sudden severe joint pain and swelling (گنٹھیا کا شدید دورہ — ڈاکٹر کو بتائیں).
Drug Interactions
| Medicine | Interaction |
|---|---|
| Verapamil / Diltiazem | Dangerous combination with Atenolol — severely slows heart rate and conduction — avoid |
| Antiarrhythmics (Amiodarone, Digoxin) | Increased risk of heart block and dangerously slow heart rate — monitor closely |
| Other antihypertensives | Additive blood pressure lowering — increased hypotension and dizziness risk |
| NSAIDs (Ibuprofen, Diclofenac) | Reduce antihypertensive effectiveness of both components — avoid regular combined use |
| Antidiabetic medicines (Insulin, oral hypoglycaemics) | Atenolol masks hypoglycaemia signs — Chlorthalidone raises blood sugar — monitor glucose closely |
| Lithium | Chlorthalidone reduces Lithium excretion — significantly increased Lithium toxicity risk |
| Corticosteroids | Antagonise Chlorthalidone diuretic effect and worsen hypokalaemia |
| Potassium-depleting medicines | Additive hypokalaemia risk with Chlorthalidone component — monitor potassium |
| Clonidine | Never stop Clonidine abruptly while on Atenolol — severe rebound hypertension |
| Uricosuric agents (Allopurinol) | Chlorthalidone raises uric acid — may require Allopurinol dose adjustment in gout patients |
| Alcohol (شراب) | Increases blood pressure lowering and dizziness — avoid excessive consumption |
Storage: Store below 25°C in a cool, dry place. Protect from moisture and direct sunlight. Keep out of reach of children (بچوں کی پہنچ سے دور رکھیں). Do not use after expiry date.
FAQs
Q: When should Blokium Diu 50mg be escalated to the 100mg strength? If blood pressure remains inadequately controlled after 4 weeks of consistent once-daily 50mg use — your cardiologist will assess whether escalation to the 100mg strength is appropriate. Many patients achieve satisfactory long-term control at the 50mg strength without requiring the higher dose.
Q: Why must Blokium Diu 50mg be taken in the morning rather than evening? The Chlorthalidone diuretic component significantly increases urination — taking it in the morning ensures this diuretic activity occurs during waking daytime hours, preventing disruptive nighttime urination that impairs sleep quality and reduces long-term treatment compliance.
Q: Does Blokium Diu 50mg affect blood sugar in diabetic patients? Yes — both components affect glucose management. Atenolol masks hypoglycaemia warning signs making low blood sugar harder to recognise, while Chlorthalidone modestly raises blood glucose. Diabetic patients must monitor blood sugar more frequently when starting or adjusting this medicine and inform their diabetes doctor about the combination.
Medical Disclaimer: This information is for general awareness only and does not replace medical advice. Always consult a qualified doctor or pharmacist before taking any prescription medicine.